They also discovered there used to be water on Mars!
The Rosetta spacecraft has detected water coming off comet 67P, the rubber duck-shaped lump of ice and dust that it placed the Philae robotic lander on last month.
The presence of water is not a surprise, but what has wrong-footed researchers is the makeup of the water, which is nothing like that seen on Earth.
Measurements from Rosetta’s Rosina instrument found that water on comet 67P /Churyumov-Gerasimenko contains about three times more deuterium – a heavy form of hydrogen – than water on Earth.
The discovery seems to overturn the theory that Earth got its water, and so its ability to harbour life, from water-bearing comets that slammed into the planet during its early…
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